Taras Kulakov is actually Czech.
JHarris: Yeah, the lying down in it kind of freaked me out. But fun! With science!
I think laying down in it for an extended period would be bad, since the CO2 and water vapor is displacing the rest of the air, but it's not outright poisonous like CO, carbon monoxide, is. The effect would basically be like holding your breath.
Problems with CO2 killing
1. There is no “ideal” way of killing animals with CO2 - both pre-fill and rising concentrations can cause welfare problems.
2. If animals are placed into a chamber containing a high concentration of CO2 (above 50 %), they will experience at least 10 to 15 seconds of pain in the mucosa of the upper airways before the loss of consciousness. This is a serious welfare problem.
3. If animals are placed into a chamber with a rising concentration of CO2, they will find it aversive at a certain level and may experience “air hunger” or dyspnoea, which is unpleasant (and, in humans, is reported as highly distressing). This may also be a serious welfare problem.
Carbon dioxide for euthanasia: concerns regarding pain and distress, with special reference to mice and rats
Lab Anim April 1, 2005 vol. 39 no. 2 137-161
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